Cool - good for you if you're financially in a position to do it.
However, your post does suggest that all things equal you'd prefer a steel Submariner, am I right? If so, why not just buy one grey? They're available in plentiful supply from grey dealers, just pick a trusted dealer (the forum can help) and you'll have a new Submariner on your wrist within a week that was sold in the Rolex AD likely days beforehand. Yes you'll pay a premium over RRP, but an awful lot less than the gold one you're planning the buy and the Subs tend to hold their premium over time anyway.
Just saying because it sounded like the steel was what you really wanted and you're viewing the gold as a necessary step. I may have got the wrong impression.
Is your deposit refundable?
Edit: Also take this with a pinch of salt and you probably know this better than I do, but don't forget that things like SIPP and ISA investments compound over time so getting money in early can pay much bigger dividends down the line. Also I have no idea what business you're in and perhaps you're booming, but just bear in mind it's a very odd time in history right now and it's worth having a decent buffer. Just my 2 cents, but I'm a cautious individual